diff --git a/src/ramble/dialog.py b/src/ramble/dialog.py
index 3d71e3f..81d36e1 100644
--- a/src/ramble/dialog.py
+++ b/src/ramble/dialog.py
@@ -428,6 +428,11 @@ class RambleDialog(QDialog):
         self.result = RambleResult(summary=summary, fields=out_fields)
         self.accept()
 
+    def closeEvent(self, event):
+        """Wait for background workers to finish before closing."""
+        self.thread_pool.waitForDone(1000)  # Wait up to 1 second
+        super().closeEvent(event)
+
 
 def open_ramble_dialog(
     *,